What is a JWT (JSON Web Token)?

A JWT, or JSON Web Token, is an open standard (RFC 7519) for securely transmitting information between parties as a JSON object. It contains a header, payload, and signature, and is commonly used for authentication and information exchange.

What is a JWE (JSON Web Encryption)?

A JWE, or JSON Web Encryption, is a compact, URL-safe representation of encrypted content using JSON-based data structures. It allows a JWT or other data to be encrypted to ensure its confidentiality during transmission.

Base64 Decode and Encode

Simple & Fast

Encode or decode any text or Base64 string instantly with a single click.

100% Client-Side

No data is sent to any server. Everything runs safely within your browser.

Developer-friendly.

Easy to use this tool to encode or decode Base64 data accurately and efficiently.

Supports Base64URL

Decrypt a JWE token to retrieve the original JWT—including the payload—for analysis.

How the Tool Works

Step 1.

Choose a character set

Select the character set you want to use, such as UTF-8. This determines how your text is converted before encoding or after decoding.

Step 2.

Encode plain text

In the Decoded Text section, type or paste your text and click Encode. The Base64 result will appear in the output area of the same section.

Step 3.

Decode Base64

In the Encoded Text section, enter your Base64 string and click Decode. The decoded text will be displayed in that section.

What Is Base64 Encoding?

Base64 is a binary to text encoding format that represents binary data using ASCII characters.
It allows binary content to be included safely inside formats such as JSON, XML, or HTTP headers.
Example:
Authgear → QXV0aGdlYXI=

What Is the Difference Between Base64 and Base64URL?

Base64URL is a version of Base64 designed for URLs and token formats. It replaces the characters + with - and / with _, and padding characters (=) are often removed for URL safety.
This format is commonly used in JWTs, OAuth tokens, and OpenID Connect.

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Base64 Decode & Encode

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